Fixed clip on QML2 rectangles to include the borders.

This is related to commit 31ebb4bf.

Task-number: QTBUG-20547
Change-Id: I6a5b6c56d440c7fa7f5546472305f62227b64c29
Reviewed-on: http://codereview.qt.nokia.com/2952


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>